Higher order MU-MIMO for LTE-A

Patent metadata

Field	Value
Publication number	US-9807617-B2
Application number	US-201113995155-A
Country	US
Kind code	B2
Filing date	Sep 29, 2011
Priority date	Sep 29, 2011
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An access node of a 3GPP LTE-based wireless communication network comprises a transmitter portion that transmits downlink control information (DCI) to at least one wireless station of a plurality of wireless stations wirelessly accessing the node as a Multi-User Multiple Input Multiple Output (MU-MIMO) wireless communication network. The DCI comprises at least one code word indicating a rank of a channel matrix between the transmitter portion of the node and the wireless station greater than 4 and a spatial-related configuration for the wireless station. In one exemplary embodiment, the transmitter portion transmits the DCI from one substantially localized geographical transmission point forming a single-cell access point for the plurality of wireless stations. In another exemplary embodiment, the transmitter portion transmits the DCI from multiple geographically substantially isolated transmission points forming a single-cell access point.

First claim

What is claimed is:

1. An access node of a wireless communication network, the access node comprising:
a transmitter portion capable of transmitting downlink control information to at least one wireless station of a plurality of wireless stations wirelessly accessing the node as a Multi-User Multiple Input Multiple Output (MU-MIMO) wireless communication network, the downlink control information comprising values corresponding to a table to indicate antenna ports, a scrambling identity, and a number of layers, wherein entries in the table include at least two code words indicating a rank of a channel matrix between the transmitter portion of the node and the wireless station, a scrambling identity, and an orthogonal cover code (OCC) for the wireless station;
wherein demodulation reference signal resource elements within a same code division multiple access (CDMA) group are orthogonal to each as a result of the OCC indicated in the downlink control information if the same scrambling sequence is used; and
wherein the table comprises:

One Codeword:
Two Codewords:

Codeword 0 enabled,
Codeword 0 enabled,

Codeword 1 disabled
Codeword 1 enabled

Value
Message
Value
Message

0
1 layer, port 7, n SCID = 0
0
2 layers, ports 7-8, n SCID = 0

1
1 layer, port 7, n SCID = 1
1
2 layers, ports 7-8, n SCID = 1

2
1 layer, port 8, n SCID = 0
2
3 layers, ports 7-9

3
1 layer, port 8, n SCID = 1
3
4 layers, ports 7-10

4
2 layers, ports 7-8,
4
5 layers, ports 7-11

n SCID = 0

5
3 layers, ports 7-9
5
6 layers, ports 7-12

6
4 layers, ports 7-10
6
7 layers, ports 7-13

7
1 layer, port 11,
7
8 layers, ports 7-14

n SCID = 0

8
1 layer, port 11,
8
2 layers, ports 11, 13,

n SCID = 1

n SCID = 0

9
1 layer, port 13,
9
2 layers, ports 11, 13,

n SCID = 0

n SCID = 1

10
1 layer, port 13,
10
2 layers, ports 7-8,

n SCID = 1

n SCID = 0, 2 DMRS Group

11
2 layers, ports 7-8,
11
2 layers, ports 11, 13,

n SCID = 1

n SCID = 0, 2 DMRS Group

12
2 layers, ports 11, 13,
12
2 layers, ports 9-10,

n SCID = 0

n SCID = 0, 2 DMRS Group

13
2 layers, ports 11, 13,
13
2 layers, ports 12, 14,

n SCID = 1

n SCID = 0, 2 DMRS Group

14
Reserved
14
3 layers, ports 10, 12, 11

15
Reserved
15
4 layers, ports 11, 13, 12, 14.

2. The access node according to claim 1 , wherein:
the downlink control information comprises one code word of the at least two code words is enabled and another code word of the two code words is disabled, the one enabled code word indicating support for up to a rank 8 MU-MIMO wireless network and each wireless station of the plurality of wireless stations of the MU-MIMO wireless network to transmit in one layer,
the downlink control information comprises one code word of the at least two code words is enabled and another code word of the two code words is disabled, the one enabled code word indicating support for up to a rank 4 MU-MIMO wireless network and each wireless station of the plurality of wireless station of the MU-MIMO wireless network to transmit in one layer with orthogonal demodulation reference signals,
the downlink control information comprises one code word of the at least two code words is enabled and another code word of the two code words is disabled, the one enabled code word indicating support for up to a rank 4 MU-MIMO wireless network and each wireless station of the plurality of wireless station of the MU-MIMO wireless network to transmit in one layer with orthogonal demodulation reference signals,
the downlink control information comprises one code word of the at least two code words is enabled and another code word of the two code words is disabled, the one enabled code word indicating support for up to a rank 8 MU-MIMO wireless network and each wireless station of the plurality of wireless stations of the MU-MIMO wireless network to transmit in two layers using a different combination of a demodulation reference signal and a scrambling identification code than another wireless station,
the downlink control information comprises two code words indicating support for up to a rank 8 MU-MIMO wireless network and each wireless station of the plurality of wireless stations of the MU-MIMO wireless network to transmit in two layers with each laye

Assignees

• Zhu Yuan
• Davydov Alexei Vladimirovich
• Intel Corp

Inventors

• Zhu Yuan
• Davydov Alexei Vladimirovich

Classifications

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W16/14 Primary

  Spectrum sharing arrangements {between different networks} · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04B7/0665

  Feed forward of transmit weights to the receiver · CPC title